[R] get() in sapply() in with()
tuechler at gmx.at
Thu Aug 3 15:45:19 CEST 2006
applying some function within a with() function I wanted to use also
sapply() and get() to form a data.frame, but did not succede.
Below is a simplified example.
It is possible to use sapply() within a with() function, it is also
possible to use get() within a with() function, but when I try to use get
within sapply within with I arrive at "Error in get(x, envir, mode,
inherits) : variable "v5" was not found".
Is there a solution?
df1 <- data.frame(v5=16:20, v6=21:25, v7=I(letters[16:20]), v8=letters[16:20])
with(df1, sapply(c('v5', 'v6'), get) ) ## Error, see next line
## Error in get(x, envir, mode, inherits) : variable "v5" was not found
with(df1, sapply(list(v5, v6), mean) ) # does work
with(df1, get('v5') ) # does work
system i386, mingw32
svn rev 38687
version.string Version 2.3.1 Patched (2006-07-23 r38687)
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